4. Should I inform about the weight changes while on entecavir drug?
Yes. You need to inform the doctor about any weight changes because the dose of the drug is based on your present weight.

5. Can entecavir prevent the transfer of hepatitis virus to my sexual partner?
No. Entecavir does not prevent the transfer of hepatitis virus to a sexual partner. So, you must follow safe sex measures as suggested by the doctor.